OpenGL里画线

xShandow

<>在OpenGL里画线语句:
+ ~/ ]0 V/ U5 k) E& C) dglBegin(GL_LINES);
   glVertex2f(x,y);
   glVertex2f(a,b);
glEnd();</P>
<>注意:目前只讨论OpenGL 2D模式.

下面是一个画线实例和效果图
% ^5 L, X& }1 M4 k. W7 g9 O#define GL_PI 3.1415f</P>
<>void Draw()
{
GLfloat x,y,angle;</P>
5 ~; q6 }8 u  E  z& |1 Z) G& V<> glPushMatrix();</P>
<> glTranslatef(300,200,0);
glColor3f(0.6f,0.6f,0.1f);
glBegin(GL_LINES);
! @9 E" w1 h0 v+ ^  for(angle=0.0f;angle&lt;3*GL_PI;angle+=0.5f)
  {
   x=150.0f*sin(angle);
   y=150.0f*cos(angle);</P>
<>   glVertex2f(x,y);</P>
<>   x=150.0f*sin(angle+3.1415f);
   y=150.0f*cos(angle+3.1415f);
+ u- [3 h, ]- o& W3 ^   glVertex2f(x,y);
6 X, d% B' W9 J, T! z+ o$ f  }
% `1 }, ?3 J) p  g0 `5 z  
* V0 B8 G6 t. N7 O# g1 F+ H; J# J glEnd();</P>
1 F7 b4 S! v* T0 r7 q7 Y; W<> glPopMatrix();
}
</P>